Re: [Xen-devel] OVMF very slow on AMD

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Wed, Jul 27, 2016 at 03:45:23PM -0400, Boris Ostrovsky wrote:
> On 07/27/2016 07:35 AM, Anthony PERARD wrote:
> > On Wed, Jul 27, 2016 at 12:08:04PM +0100, Anthony PERARD wrote:
> >> I can try to describe how OVMF is setting up the memory.
> > From the start of the day:
> > setup gdt
> > cr0 = 0x40000023
> 
> I think this is slightly odd, with bit 30 (cache disable) set. I'd
> suspect that this would affect both Intel and AMD though.
> 
> Can you try clearing this bit?

That works...

I wonder why it does not appear to affect Intel or KVM.

Thanks,

-- 
Anthony PERARD

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